Why does phenolphthalein indicator not turn red until pH

Litmus was probably the most popular choice of acid-base indicator, but it is not a good choice for colour-blind chemists. The use of phenolphthalein as an acid-base indicator comes a close second. Phenolphthalein (XIII) is another weak organic acid. It is not particularly water soluble, so we generally dissolve it in aqueous ethanol. The ethanol explains the pleasant, sweet smell of phenolphthalein solutions. 

Phenolphthalein is colourless and clear in acidic solutions, but imparts an intense puce pink colour in alkaline solutions of higher pH, with k(max = 552 nm. The coloured form of phenolphthalein contains a quinone moiety in fact, any chromophore based on a quinone has a red colour. But if a solution is prepared at pH 7 (e.g. as determined with a pH meter), we find the phenolphthalein indicator is still colourless, and the pink colour only appears when the pH reaches 8.2. Therefore, we have a problem the indicator has not detected neutrality, since it changes colour at too 

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